Sport-Plus was a special release of the Sportster. The center design is different, as is the machined "Dif-e-Yo" logo at center. This one is also Nickel Plated for a super mirror finish.
The Sport-Plus was created when a problem arose with the Dif-e-Yo Wide Load Collector Edition models. The parts were salvaged and remachined to create this unique model. Only enough parts were salvaged to make 23 Sport-Plus. So this is very rare Dif-e-Yo model.
These came in a special Collector's Can from Dif-e-Yo. Half came with orange rings, and half with blue. Blue Ring version is pictured in the package views.